prosody
9a70a543c727
util/caps.lua

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util/caps.lua @ 11962:9a70a543c727

util.async: Add next-tick configuration Running woken runners in the next iteration of the event loop prevents unexpected recursion, unexpected tracebacks, and is generally more predictable. The pattern is borrowed from util.promise, where we're now doing the same.
author Matthew Wild <mwild1@gmail.com>
date Mon, 29 Nov 2021 14:14:30 +0000
parent 8555:4f0f5b49bb03
child 12975:d10957394a3c
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local base64 = require "util.encodings".base64.encode;
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10 local sha1 = require "util.hashes".sha1;
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12 local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat;
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13 local ipairs = ipairs;
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15 local _ENV = nil;
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16 -- luacheck: std none
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17
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18 local function calculate_hash(disco_info)
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19 local identities, features, extensions = {}, {}, {};
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20 for _, tag in ipairs(disco_info) do
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21 if tag.name == "identity" then
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22 t_insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
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23 elseif tag.name == "feature" then
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24 t_insert(features, tag.attr.var or "");
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25 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
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26 local form = {};
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27 local FORM_TYPE;
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28 for _, field in ipairs(tag.tags) do
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29 if field.name == "field" and field.attr.var then
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30 local values = {};
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31 for _, val in ipairs(field.tags) do
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32 val = #val.tags == 0 and val:get_text();
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33 if val then t_insert(values, val); end
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34 end
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35 t_sort(values);
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36 if field.attr.var == "FORM_TYPE" then
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37 FORM_TYPE = values[1];
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38 elseif #values > 0 then
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39 t_insert(form, field.attr.var.."\0"..t_concat(values, "<"));
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40 else
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41 t_insert(form, field.attr.var);
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42 end
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43 end
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44 end
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45 t_sort(form);
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46 form = t_concat(form, "<");
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47 if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
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48 t_insert(extensions, form);
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49 end
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50 end
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51 t_sort(identities);
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52 t_sort(features);
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53 t_sort(extensions);
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54 if #identities > 0 then identities = t_concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
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55 if #features > 0 then features = t_concat(features, "<").."<"; else features = ""; end
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56 if #extensions > 0 then extensions = t_concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
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57 local S = identities..features..extensions;
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58 local ver = base64(sha1(S));
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59 return ver, S;
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60 end
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61
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62 return {
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63 calculate_hash = calculate_hash;
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64 };